Suggestion 1)
For players who either: Don't have a clan or who don't wish to change clan, it can be considered sub-optimal to force them to create a clan and rooms just to make extra item storers.
One option is to create player item holders, but it would be more elegant (And this is one of the main reasons the initial vaults were made for each person), to be able to upgrade your Personal Item Vault.
As a 100 item vault costs a minimum of 170k (20k + 50k + 100k). But you already start with a 50 item vault. I would suggest (If possible to upgrade in factors of 10), to charge 10k, 20k, 30k, 40k for each additional 10 spots.
If the squares are hard coded to 100 spaces (As they could well be). Then I would suggest a fee of around 75k (As this is a forced upgrade it should be less than the 100k cost of incrementals) to upgrade your existing 50 item vault to a 100 item vault.
Suggestion 2)
Much simpler (And only for 1alt), Introduce "JUST" Thomas Lambert into the game, and allow people to remove duplicate items they've been hoarding for Gold Sovereigns. For now they wouldn't need Amanda, as people would need to clear items out and hoard a load of these items.
The main usage would be to clear down excess items. We can worry about what to have them trade for later. It also would see lower levels able to repeatedly boss enemies such as Aglon for an item that could be traded into the Farthing/Coin system. As well as bosses such as DG maybe get a bit more attention.
